1 ///////////////////////////////////////////////////////////////////////////////
2 /// \file regex_traits.hpp
3 /// Includes the C regex traits or the CPP regex traits header file depending on the
4 /// BOOST_XPRESSIVE_USE_C_TRAITS macro.
5 //
6 // Copyright 2008 Eric Niebler. Distributed under the Boost
7 // Software License, Version 1.0. (See accompanying file
8 // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
9
10 #ifndef BOOST_XPRESSIVE_REGEX_TRAITS_HPP_EAN_10_04_2005
11 #define BOOST_XPRESSIVE_REGEX_TRAITS_HPP_EAN_10_04_2005
12
13 // MS compatible compilers support #pragma once
14 #if defined(_MSC_VER)
15 # pragma once
16 #endif
17
18 #include <boost/type_traits/is_convertible.hpp>
19 #include <boost/xpressive/detail/detail_fwd.hpp>
20
21 #ifdef BOOST_XPRESSIVE_USE_C_TRAITS
22 # include <boost/xpressive/traits/c_regex_traits.hpp>
23 #else
24 # include <boost/xpressive/traits/cpp_regex_traits.hpp>
25 #endif
26
27 namespace boost { namespace xpressive
28 {
29
30 ///////////////////////////////////////////////////////////////////////////////
31 // regex_traits_version_1_tag
32 /// Tag used to denote that a traits class conforms to the version 1 traits
33 /// interface.
34 struct regex_traits_version_1_tag
35 {
36 };
37
38 ///////////////////////////////////////////////////////////////////////////////
39 // regex_traits_version_2_tag
40 /// Tag used to denote that a traits class conforms to the version 2 traits
41 /// interface.
42 struct regex_traits_version_2_tag
43 : regex_traits_version_1_tag
44 {
45 };
46
47 ///////////////////////////////////////////////////////////////////////////////
48 // regex_traits_version_1_case_fold_tag DEPRECATED use has_fold_case trait
49 /// INTERNAL ONLY
50 ///
51 struct regex_traits_version_1_case_fold_tag
52 : regex_traits_version_1_tag
53 {
54 };
55
56 ///////////////////////////////////////////////////////////////////////////////
57 // has_fold_case
58 /// Trait used to denote that a traits class has the fold_case member function.
59 template<typename Traits>
60 struct has_fold_case
61 : is_convertible<
62 typename Traits::version_tag *
63 , regex_traits_version_1_case_fold_tag *
64 >
65 {
66 };
67
68 ///////////////////////////////////////////////////////////////////////////////
69 // regex_traits
70 /// Thin wrapper around the default regex_traits implementation, either
71 /// cpp_regex_traits or c_regex_traits
72 ///
73 template<typename Char, typename Impl>
74 struct regex_traits
75 : Impl
76 {
77 typedef typename Impl::locale_type locale_type;
78
regex_traitsboost::xpressive::regex_traits79 regex_traits()
80 : Impl()
81 {
82 }
83
regex_traitsboost::xpressive::regex_traits84 explicit regex_traits(locale_type const &loc)
85 : Impl(loc)
86 {
87 }
88 };
89
90 ///////////////////////////////////////////////////////////////////////////////
91 // lookup_classname
92 /// INTERNAL ONLY
93 template<typename Traits, std::size_t N>
94 inline typename Traits::char_class_type
lookup_classname(Traits const & traits,char const (& cname)[N],bool icase)95 lookup_classname(Traits const &traits, char const (&cname)[N], bool icase)
96 {
97 typename Traits::char_type name[N] = {0};
98 for(std::size_t j = 0; j < N-1; ++j)
99 {
100 name[j] = traits.widen(cname[j]);
101 }
102 return traits.lookup_classname(name, name + N - 1, icase);
103 }
104
105 }}
106
107 #endif
108